J. Aczél: Lectures on Functional Equations and Their Applications
. Academic Press, New York and London, 1966. MR 0208210
 F. Neuman: Global Properties of Linear Ordinary Differential Equations
. Academia, Praha, 1991. MR 1192133
| Zbl 0784.34009
 D.V. Lang: Deep-level transient spectroscopy—A new method to characterize traps in semiconductors. J. App. Phys. 45 (1974), no. 7, 3014–3023.
 C.R. Crowel, S. Alipanahi: Transient distortion and $n$-th order filtering in depth level transient capacitance spectroscopy. Solid-State Electronics 24 (1981), 25–36.
 I. Thurzo, K. Gmucová: Simple DLTS korelator with improved selectivity. Czechoslovak J. Phys. A 34 (1984), 272–279. (Slovak)
 J. Thurzo: Research DLTS replay through Walsh-Fourier transformation and synthese DLTS through the filter of highest grades. Czechoslovak J. Phys. A 41 (1991), 354–368. (Slovak)
 P. Janovský: Possibilities of interpretation of anomalous behavior of DLTS spectra. PhD. thesis, Technical University of Brno – FE, 1989, pp. 112. (Czech)